linux-kernel - Re: [PATCH bpf-next 2/2] bpf: Take return from set_memory_rox() into account with bpf_jit_binary_lock

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Message-ID: <ddd5157cc9e61c218edff5cae572119d67b2717d.camel@linux.ibm.com>
Date: Mon, 19 Feb 2024 16:33:33 +0100
From: Ilya Leoshkevich <iii@...ux.ibm.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>,
        Alexei Starovoitov
 <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko
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        Martin KaFai Lau <martin.lau@...ux.dev>,
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        Yonghong Song
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        John Fastabend <john.fastabend@...il.com>,
        KP
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        Hao Luo
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        Russell King
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        Puranjay Mohan <puranjay12@...il.com>,
        Zi Shen Lim
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        Will
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        Hengqi Chen
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        Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui
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        Sven Schnelle <svens@...ux.ibm.com>,
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        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Cc: bpf@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        netdev@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        "linux-hardening @ vger . kernel . org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH bpf-next 2/2] bpf: Take return from set_memory_rox()
 into account with bpf_jit_binary_lock_ro()

On Sun, 2024-02-18 at 11:55 +0100, Christophe Leroy wrote:
> set_memory_rox() can fail, leaving memory unprotected.
> 
> Check return and bail out when bpf_jit_binary_lock_ro() returns
> and error.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
> Previous patch introduces a dependency on this patch because it
> modifies bpf_prog_lock_ro(), but they are independant.
> It is possible to apply this patch as standalone by handling trivial
> conflict with unmodified bpf_prog_lock_ro().
> ---
>  arch/arm/net/bpf_jit_32.c        | 25 ++++++++++++-------------
>  arch/arm64/net/bpf_jit_comp.c    | 21 +++++++++++++++------
>  arch/loongarch/net/bpf_jit.c     | 21 +++++++++++++++------
>  arch/mips/net/bpf_jit_comp.c     |  3 ++-
>  arch/parisc/net/bpf_jit_core.c   |  8 +++++++-
>  arch/s390/net/bpf_jit_comp.c     |  6 +++++-
>  arch/sparc/net/bpf_jit_comp_64.c |  6 +++++-
>  arch/x86/net/bpf_jit_comp32.c    |  3 +--
>  include/linux/filter.h           |  4 ++--
>  9 files changed, 64 insertions(+), 33 deletions(-)

Reviewed-by: Ilya Leoshkevich <iii@...ux.ibm.com>  # s390x